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Analysis of mine ventilation and other plot Kong Dingyi


nalyzesanddiscussesthedefinitionoftwoequivalentorificeandpointsoutthefightdefinitionofit. KeyWords: equivalentorifice; sheet; windpressure; staticpressure; airquantity; ventilationresistance0 introduction in the mine ventilation, mine ventilation in order to measure the degree of difficulty, using an imaginary visualize the concept that ventilation and other plot holes. Use this hole to measure the size of the ease of ventilation convenient, and intuitive. Other plot holes by the size of the mine area is divided into easy,[link widoczny dla zalogowanych], medium, three levels of difficulty. Other plot holes in the mine ventilation is how to define it? In the current textbooks and reference books in the mine ventilation, there are two different definitions, due to different definition would cause people to understand the difficulties. The following definitions for the two to introduce and analysis. 1 plot holes such as the definition of an assumption in an infinite space with a plate (wall),[link widoczny dla zalogowanych], in the plate (wall) to open an area on the A (m) of the hole, shown in Figure 1. When the orifice is equal to mine through the air volume air flow Q, the wind pressure is equal on both sides of the orifice of Mine Ventilation h, then the hole in the area known as the equal area A hole]. Calculation of plot holes, by definition the area, which is actively seeking other parameters of the hole and the mine ventilation air volume and pressure relationship. Away from the orifice in the orifice on the left far enough to take cross-section 1-1 of this section of the static pressure P. , Wind speed. = 0; the smallest contraction in the orifice cross section at the right side of romantic cross-section 2-2 to take the cross-section area, where static pressure p, wind speed, air flow energy loss in the process flow is negligible. By definition lists relationships: z7z7Pl + a (P2 +) = h (1) simplified as: U2: 2 (p,-Pz-h) a (2) = a (】 P where P is air density. we can see by the Fluid Dynamics: A = 0.65AQ = A = 0.65Av, Author: Lvzhi Hai (1956 a), male,[link widoczny dla zalogowanych], Shaanxi Fufeng, associate professor, engaged in teaching and mine ventilation and mine safety design. l6 Shaanxi Energy Professional Technical College are: = substitute (2), solve plot holes and other area: v 0.65. 'p (3) where p desirable state of mine air density of the standard, p = 1.2kg / m, P, P: can not determine a specific value, therefore, this formula is of no practical value, and with the calculation formula of plot holes in different forms. pVl2 Figure l22 second such plot Kong Dingyi assume an infinite space with a plate (wall), in sheet (wall) to open an area on the A (m) of the hole, as shown in Figure 1. When the air flow through the hole IEl mine air volume is equal to Q,[link widoczny dla zalogowanych], on both sides of the static pressure holes IEl ventilation resistance is equal to h,[link widoczny dla zalogowanych], then the hole area known as the other plot holes. 1,2 Figure 1 shows the cross section of the energy equation: =; for,: 0P, a P: = (5 a) of the 1-22, by the definition of \equal to the ventilation resistance h \1.2kg / m into (6), can be solved:. or where - mine the total drag, N ・ s2 / m. or kg / m '. 3 Conclusion The above definition of the two other plot holes, the first which emphasizes the \pressure, dynamic pressure, position and pressure of the difference. derived from the above shows, the first derivation of such a definition and calculation formula of plot holes plot holes such as the formula in different forms, can not be used, therefore, the first such plot holes The definition is wrong. The second definition of derivation of such results with the same formula plot holes. Therefore, the correct equal-area Kongding Yi should be: assume that in an infinite space with a plate (wall), in the plate (wall) One area on the open (IIl2) of the hole, when the orifice is equal to mine through the air volume air flow Q, the orifice is equal on both sides of the static pressure ventilation (4). resistance h, then the hole in the area known as the Equal Area A holes. References: [1] Zhang Guoshu, Tan Yun-Zhen, Chen Kai Yan et al. Ventilation security, [M]. Xuzhou: China University of Mining Press, 2000. [2] Wu Zhongli. mine ventilation and safety [M]. Xuzhou: China Mining University Press, 1989. [3] any Cave. mine ventilation and safety [M]. Beijing: Coal Industry Press, 1993.
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